1. I believe in the most recent versions not necessary 2. No, don't do it as you did. This is only necessary for variables that you want to have shared during the parallel calculations.
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Sjoerd C. de VriesJun 3 '13 at 21:29

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@SjoerdC.deVries Adding to 1. From the documentation: "The default value is DistributedContexts:>$DistributedContexts with $DistributedContexts:=$Context, which distributes definitions of all symbols in the current context, but does not distribute definitions of symbols from packages." So you are right!
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sebhoferJun 4 '13 at 9:22

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